Micrometer-caliper.



HRRY A. REBELSKI, 0E BROOKLYN, NEW

MICRGMJETER-CALIPER.

risente.

To all 'whom 'it magi/'concertar Bel it 'known that I, HARRY A. Rnnrsm,

a citizen of, the United States, residing at Brooklyn, inthe county oi Kings, State' of ing to be a full, clear, and exact description fot the invention, such as will enable others Mig' `make and use the same.

skilled in the art to which it appertains to This invention relates yto a micrometer caliper, and while I have illustrated it as embodied in aI particular type of caliper' it -obvious that the in any of the several types of micrometer has merely7 been for the sake of illustration for as the descr' )tion'progresses it will be vention may be embodied calipers.

btt

An object of the invention is to so construct the device that readings ,may be/taken ytherefrom in either the English or metric systems simultaneously.

A further object of the invention is 'to make provision for thev translating of a reading from one system to the other.

A stilll further object of the invention is to construct thev device in such manner that the reading lines will be so located that all possibility of confusion in taking the several readings or in translating from one to the other will be obviated.

lVith these and other objects in view, such as will appear as the description progresses, my invention comprises the combination and arrangement of parts as herein set forth and subsequently claimed.

Figure l is a side elevation of a micrometer constructed in accordance with my invention. Fig. 2. is a similar view of the sleeve. Fig. 3 is a diagrammatic view of the barrel showing 'the graduations thereon. Fig. 4 is an enlarged view showing a particular reading which will be described.v

Referring to. the drawing wherein like parts are indicated by like characters throughout the several views zthe micrometer illustrated is of the ordinary formation havinga frame A, an anvil B, spindle C on which is formedthe adjusting screw threads D. Formed on the frame A. is a barrel E and formed on the spindle C is a sleeve F which normally encircles the barrel E. This is the ordinary construction of' a micrometer oi this class and it is not thought necessary to go into the minute details of construction Specication of Letters Patent.

' and metric s rammed oet. 5, iets.-

applicatimi lea september a1, 1914. serial No. 862,784.

thereof as my invention' does not radically change this construction.

Before entering into a detailed description of my invent-ion it may be well to here state that the smallest measurements on the English ystems which are equal in round numbers, that is, without the employment of fractions or decimals is eight meters (8000) millimeters and three-hundred and fifteen inches ('26 ft.. and 3 inches). To be more exact 8,001 millimeters equals 315 inches as one inch equals 2.54 cm. Any measurements below this become fractional'v when translated from one to the other and inasmuch as the micrometer of the ordinary construc-- tion indicates readings below twenty-six feet and three linches it is necessary to specially construct the reading lines on the barrel to compensate for this fractional difierence and for this purpose I have provided two diverging lines G and H which start from a common zero point I and are drawn helically about the barrel.

The line G is divided into millimeters and sub-divided into halffmillimeter's, While the line H is divided into tenths of inches with Subdivisions of iftieths of inchesthe measurements on each of the lines G and H gradually increasing as the lines diverge from the common point of Zero.

The sleevev .is beveled on the edge in the ordinary mannerr and this edge is divided into one-hundred equal parts, the divisional lines beingV indicated by the reference 'character K. Every tenth of these lines extends upwardly and is designated by the proper numeral L from zero to one-hundred, While every twenty-fifth line is carried farther up and is designated by the proper numeral M. By observing Fig. 2 of the 'drawing it will be noted that the zero on the series of numbers L coincides with the zero on 4the, series M, the numerals one hundred and twenty coinciding with each of' the zeros respectively. The designations on the series L indicate tentwo-hundredlhs of a millimeter, while the designations in the i would have to be turned lifty times to get from zero to one inch, or forty-nine times and a fraction to get from zero to twenty five millimeters. It being remembered that one inch is equal to approximately twenty-five and four tenths millimeters. It I should want to use this micrometer the English reading line would be straight, or parallel to the axis, and the metric reading" line would have to be helical, and this helical line would be produced by opening the micrometer to -where it takes in twenty-five millimeters. The location of thev Zero on the thimble would then be noted and transferred over lonto the barrel and connected by a helical line downward to the barrel Zero. Now, it I was to adopt a thread of ifty threads to twenty-five millimeters, then the thimble would have to be t-urned fifty times to get from zero to twenty-tive millimeters or fifty times and a fraction to take in one inch. It' I should want to use this micrometer the metric reading line would be straight, or parallel to the axis, and the English reading line would have ,to be helical, and 'this helical line would be produced by opening the micrometer to where it takes in one inch. The location of the zero on the thimble would then be noted and transferred over onto the barrel and connected by a helical line downward to the barrel Zero.

I adopt a thread of fifty and four-tenths tothe inch,l as a good mediating thread between the two mentioned heretofore. By doing so I get two helical diverging reading lines and each of them will lie halt' as much on an incline as if one of them would lie parallel to the axis. In opening this micrometer more and more the right hand reading line travels more and more to the right andthis plus will exactly compensate for that which the threadis too fine for the English reading. Fortheleft hand reading line, as the thimble is opened more and more I confront a minus which is also compensated forby that which the thread is too coarse for the metric reading. IYhen this is done and the sleeve turned the reading may be taken off of either the English scale or the metric scale and when taken in connectionl with the graduations on the sleeve will translate from one tothe other in such manner as to be readily read.

Ifig. l of the drawing shows the sleeve 'in such position that the' zero on the scale )I thereon'alines with the one-inch mark on the scaleH on the barrel. thus indicating that the distance between the anvil and the extremity of the spindle is one-inch, nov'v should it be desired to translate this meas`- irement from the English reading to the metric reading the operator looks at the scale G and observes the last of the millimeter marks thereon, which in this case twenty-live, has been passed to an amount of four-fifths ,of a revolution, the line eighty of the scale L intersects the divergin'g line various articles may be measured and the readings taken either in the English or in the metric systems or in both. I have so constructed the device that the reading lines are arranged in such manner that the gradnations in the systems will be independent and will be marked on diverging lines on the barrel.

I have so constructed the device that the threads on the spindle will be of such pitch as to compensate Jfor the divergenceof the lines.

IVhile I have illustrated and described a particular embodiment of my invention, I have menely done so for the sake of convenience and I lo not wish to 'be limited to that particuh embodiment as it is 0bvious that numerous changes may be-made within the scope of the invention as defined by the claims; y y ,Y

That is claimed is 1. In a micnometer caliper including a barrel, sleeve, and spindle diverging reading lines on the said barrel, the said lines starting from acommon point of zero, metric graduations on one of the said lines and English graduations on the other of the said lines, divisional lines on the edge of the said sleeve, certain of said lines being located to be read in conjunction With the metric graduations andthe other of the said lines being located to be read in conjunction with the English graduations, the said spindle having screw threaded engagement with the barrel, the threads being of such pitch as to produce the readings, simultaneously, upon themovement of the spindle with relation to the barrel.

Q. A micrometer caliper having diverging lines on the barrel thereof starting from Aa common point of zero, metric graduations on .one of said lines and English graduations on the other of said lines, and divisional marks on the sleeve, certain of said marks being adapted to cooperate with the metric graduations and other of said marks being adapted to cooperate with the English graduations t-o produce a reading in either of the metric or English systems, the spindle of the said micrometer having a thread, of titty and four-tenths to the inch, thereon.

inicrometer caliper including a barrel, spindle and' sleeve. diverging reading lines on the said barrel having graduations in the metric and English systems thereon, the edge of the sleeve having divisional IOO marks thereon, cez'ain of'said marks being the divergenceof the lines from a Eine par constructed to coperate with the English :diei to the said axis. l0 reading line and other of said mai-ks being' ri testimony whereof, affix my signa- Consfructed to cop'eiute with the remaining ture, in the presence of two Witnesses.

5 reading line, the said reading lines diverg- HARRY A. REBELSK.

ing from a common point of zero on the sur- Vfitnesses: fue@ of the barrel. und threads on the said HENRY W. SCHNMDHP., spindle of such pitch ns to compensate for 'FRANK E. ML'LL'Iix.

Copies of this patent may be btaned for iive cens each, by addressing the Comminer of Patents,

Washington; D. C. 

